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Old 10th March 2008, 01:47 AM   #531
bcherry is offline bcherry  Hong Kong
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Default K.I.S.S. method

Hi Chris,
Since you have two sealed subs already, why not put the D5e in an appropriately sized sealed box, mount it on top of the subs at the desired height, suitably decoupled either straddling the subs on it own stand or similar to Warwicks design resting on top and run it full range. If the frequency response looks similar to the D5nf it will need a wide baffle to flesh out the 100-200hz range and about 10L for a nice 6db/oct rolloff. Since both sub and mains will be in a sealed box phase will be coherent it will be easier to get a seamless transition. All level and frequency shaping can be handled by the bass control.

Brian

PS: suggest to drive the subamps from the main amp out through a dropper resistor into the low level inputs if your subs have that facilty
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Old 16th March 2008, 12:51 PM   #532
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Amazing what you can do with photoshop, isn't it?

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Old 17th March 2008, 06:32 AM   #533
bcherry is offline bcherry  Hong Kong
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Default 13L Featrex D5nf

Quote:
Been running a week now. The D5nf are mounted is a 13L box with vent. After getting WT3 I found the box was tuned too low so shortened the vent by 40% to get it back to the desired 45hz. It's still running in but can throw some heft in the bass. Treble is great. The attached is as measured in my room, at listening position. The room is untreated and there are a lot of reflections but it does illustrate the bandwidth. I cut the side going down to 10hz because the ground here shakes constantly. I had to do the measurements on a Sunday to get a halfways quiet environment. Also tried different taps, 4/8 and 16 ohms. Best response is definitely 16ohms. Compared to 16 ohms the treble falls away 4db/20khz, 3.5dd/10khz, 1db/1khz, 2.5db/100hz, 3db/65hz. on the 4 ohm tap.
Just to update: I've done 2 things since the above:
1. installed the 0-8-16-22ohm OPT and
2. mounted the drivers from the back and removed teh basket rim mounting screws.

Last time I compared 4/16ohms. The difference between 8/16ohms was less than half to 4/16ohms numbers. The 22ohm OPT doesn't have the 4 ohms taps so will have to compare with what we've got:

referenced to 8 ohm: frq/db change 16/22ohm tap
70hz/+0.75/+1db
100hz/+1.2/+1.5db
1khz/-0.2/-0.4db
5khz/+0.2/+0.5db
10khz/+0.4/+0.5db
20khz/+0.6/+1.5db

So there is still a little to be gained at the frequency extremes with the higher taps although not as great as 4/16ohm comparison.

Also I used WT3 to test the box tuning and F has dropped from 45 to 42.4hz so I'll pull out the drivers and retest as seems the driver is loosening up and Fs dropping? I guess the Vas getting larger then too.

Attached is the frequency response in room. Can't exactly be compared to my last measurement as probably the mic is in a different position and some boxes etc changed position.

I'm getting the feeling the amount of stuffing needed when the drivers were new is now too much. I'll pull out some in the next few days and see how that changes things.

Regards
brian
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File Type: jpg d5nf.jpg (56.1 KB, 883 views)
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Old 17th March 2008, 12:58 PM   #534
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Dear

"The truest test for me is that my wife says its the best sound we've ever had here and she's heard all of the other Feastrex drivers, not to mention all of the other previous speakers."

Which one you and your wife think sounds best D5e ver II or D9e?.

What kind of music are you listening the D5ever II and D9 with?.

Thanks
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Old 17th March 2008, 04:59 PM   #535
Zoran is offline Zoran  Serbia
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Hi
Yesterday I was at the RAAl audio
we listened new loudspeaker system from RAAl
and did not have the energy to move all sys and replace with the
D9nf in some kind of cabinet I dont remebered but not horn
Maybe other time
(news out of topic:
RAAL preparing a ribbon tweeter with 3K load for direct
tube loading... so just one transformer inside the ribbon....)
my impressions
I saw, and take a close look at the
some specimens of feastrex drivers
D9nf
D5nf
and moving mechanism paper cone and surround from D5nf
with a signature of the inventor...
the realisation is very serious, precise, and good looking.
the drivers are very heavy and robust,
paper cone is very good, with inteligent tecnical solutions
starr at the cone side to make it stronger...
surround is from natural skin and with medium to light rigidity
that on fingers match the canteliver mechs.
The moving mass is not rigid and it is medium to light movable
all in all excelent first impressions
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Old 20th March 2008, 07:33 AM   #536
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Default D5e

Dear Gelato Monster,

"Which one you and your wife think sounds best D5e ver II or D9e?.

What kind of music are you listening the D5ever II and D9 with?."


The D5e Type II is certainly the most natural sounding driver I have ever heard. Everything about it is right. We listen to all kinds of music. I especially love Bluegrass, Alison Kraus, Blue Highway etc, but Jazz, Brazillian Jazz, world music - Indian, Persian, Middle Eastern, classical, tasteful rock. Everything sounds good on both the D9e II and the D5e II. The D5e II seems to have the more perfect balance, more open top end, but still incredibly rich and full, and it goes quite deep. It is a remarkable achievement.

Joe Cohen
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Old 21st March 2008, 10:04 AM   #537
Secips is offline Secips  United States
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Default Re: 13L Featrex D5nf

Quote:
Originally posted by bcherry



Also I used WT3 to test the box tuning and F has dropped from 45 to 42.4hz so I'll pull out the drivers and retest as seems the driver is loosening up and Fs dropping?
Driver mounting may affect compliance and Fs
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Old 22nd March 2008, 11:05 AM   #538
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Mmm, yummy. Feastrex and WE205D, all Western Electric tubes. Looks like one of my buddies is getting off to a good start . . .

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-- Chris
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Old 22nd March 2008, 12:19 PM   #539
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. . . and into the box . . .
Click the image to open in full size.

Right about now, he's in 7th heaven . . .

Without your love,
It's a honky tonk parade.
Without your love,
It's a melody played in a penny arcade . . .
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Old 24th March 2008, 01:44 PM   #540
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I thought I'd share a few comments from my correspondent concerning his new speakers, shown in the last two posts. He has been a big fan of fullrange drivers, in addition to having used some large multi-way speakers over the years. He built the power supply himself but he is eventually probably going to build a more powerful one since he would like to have the ability to apply a higher voltage than his P/S is capable of. Initially he is using the voltage at 15V and will take it up higher in the coming days.

"My speakers are not for impressing other people . . . I listen by myself, and I generally listen at low volumes, while reading books and nursing a glass of my favorite poison.

"Altec and JBL speakers are too large for me, and their sound grates on my nerves after a while. They seem to lose their bass when you listen to them at low levels, and the emphasis of middle and high frequencies a low volumes is what I find irritatitng.

"I bought these 5-inch Feastrex field coil drivers because they appealed to my interests and my aesthetic sense, and because they fit my personal prejudices. I admit, however, that leading up to this purchase I had one lingering worry about these speakers -- how would their bass sound at low volume levels?

"Because of my visits to the Feastrex listening room, I already knew that they had amazing brilliance, tightness, solidity, and power. But I was still worried about how the bass was going to sound under my low-volume listening levels. After all, you can only expect so much from a 5-inch driver . . .

"In the very large, very live-sounding Feastrex listening room, where we played at extremely high volume levels, the bass was very impressive indeed, but surely that was due to a hidden subwoofer somewhere . . . (just kidding). In contrast, my room is tiny -- tiny and dead, being of typical Japanese construction with a grass tatami mat floor . . . not conducive to the production of really satisfying bass.

"For my initial listening tests I like to use a Stan Getz recording of big band bossa nova music. The rhythm is carried by the bass, rather than by drums -- a constant flowing of bass throughout the music, overlaid by piano, guitar, sax, trumpet, percussion, etc. This kind of music I find useful for exposing the strengths and weaknesses of speakers for playing my kinds of music. You can check the behavior and performance of the speakers across a broad range of frequencies all during the same phrase of the music, as well as the soundstage, imaging and definition of each instrument. When the reproduction is good, you can really get into the music, and when it's not, the music quickly becomes boring.

"These speakers are still new and I expect they will continue to get better for a long time, but one thing is immediately clear: even at really low volume levels, there is still a great deal of detail, even in the bass. You don't lose the bass no matter how low you turn it down. And the maracas, the high hat, etc. are also extremely clear, full, and clean. You can really get into the music, with each instrument being very clearly defined and vibrant even when the volume is turned way down."
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